Adjustments to match Opster, readability

docs/reference/query-dsl/bool-query.asciidoc

@@ -6,28 +6,31 @@
 
 A query that matches documents matching boolean combinations of other
 queries. The bool query maps to Lucene `BooleanQuery`. It is built using
-one or more boolean clauses, each clause with a typed occurrence. The
+one or more boolean clauses, each clause with a typed occurrence.  The
 occurrence types are:
 
 [cols="<,<",options="header",]
 |=======================================================================
 |Occur |Description
 |`must` |The clause (query) must appear in matching documents and will
-contribute to the score.
+contribute to the score. Each query defined under a `must` acts as a logical "AND", returning only documents that match _all_ the specified queries.
+
+|`should` |The clause (query) should appear in the matching document. Each query defined under a `should` acts as a logical "OR", returning documents that match _any_ of the specified queries.
 
 |`filter` |The clause (query) must appear in matching documents. However unlike
 `must` the score of the query will be ignored. Filter clauses are executed
 in <<query-filter-context,filter context>>, meaning that scoring is ignored
-and clauses are considered for caching.
-
-|`should` |The clause (query) should appear in the matching document.
+and clauses are considered for caching. Each query defined under a `filter` acts as a logical "AND", returning only documents that match _all_ the specified queries.
 
 |`must_not` |The clause (query) must not appear in the matching
 documents. Clauses are executed in <<query-filter-context,filter context>> meaning
 that scoring is ignored and clauses are considered for caching. Because scoring is
-ignored, a score of `0` for all documents is returned.
+ignored, a score of `0` for all documents is returned. Each query defined under a `must_not` acts as a logical "NOT", returning only documents that do not match any of the specified queries.
+
 |=======================================================================
 
+The `must` and `should` clauses function as logical AND, OR operators, contributing to the scoring of results, but these results will not be cached for faster retrieval. In contrast, the `filter` and `must_not` clauses are used to include or exclude results without impacting score—unless used within a `constant_score` query.
+
 The `bool` query takes a _more-matches-is-better_ approach, so the score from
 each matching `must` or `should` clause will be added together to provide the
 final `_score` for each document.